Fabrication of Morin Incorporated Graphene Modified Electrode and Its Selective and Sensitive Determination of Dopamine

KeyWord:morin  graphene  modified electrode  dopamine  selective determination

Abstract:

      A morin/graphene modified glassy carbon electrode(M/GN/GCE) was fabricated by electro-polymerizing morin(M) on the surface of graphene nanosheets(GN).Taking the dopamine(DA) and ascorbic acid(AA) as model compounds, the electrochemical behaviors of the modified electrode were investigated by using cyclic voltammetry(CV) and differential pulse voltammetry(DPV).In pH 7.0 phosphate buffer solution(PBS),the anodic peak potentials of DA and AA were 0.172 V and-0.183 V,respectively,with a peak to peak separation up to 355 mV.In comparison with bare glassy carbon electrode(GCE),morin modified glassy carbon electrode(M/GCE) and graphene modified glassy carbon electrode(GN/GCE),the M/GN/GCE has superior electrocatalytic activity toward the oxidation of DA.The results demonstrated that the aromatic structure of M endows it strongly adsorption on GN via ¦Ð-¦Ð stacking which could improve the selectivity and sensitivity for the determination of DA in the presence of AA.The peak currents obtained from DPV were linearly related to the concentrations of DA in the range of 2.0¡Á10-8-5.5¡Á10-4 mol/L with a detection limit of 9.0¡Á10-9 mol/L.